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author | Tavian Barnes <tavianator@gmail.com> | 2010-11-06 16:57:33 -0400 |
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committer | Tavian Barnes <tavianator@gmail.com> | 2010-11-06 16:57:33 -0400 |
commit | d7e9d913730b96a83751863ad896648488296532 (patch) | |
tree | 14d16fc53339b272fef7d33092dd5eb89da9d5e6 /libdimension/checker.c | |
parent | fd741e79c56c78de91ab3cbcbeaee28eddcee2dd (diff) | |
download | dimension-d7e9d913730b96a83751863ad896648488296532.tar.xz |
Add pattern framework, impelement checker pattern.
Diffstat (limited to 'libdimension/checker.c')
-rw-r--r-- | libdimension/checker.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/libdimension/checker.c b/libdimension/checker.c new file mode 100644 index 0000000..9c1de34 --- /dev/null +++ b/libdimension/checker.c @@ -0,0 +1,58 @@ +/************************************************************************* + * Copyright (C) 2010 Tavian Barnes <tavianator@gmail.com> * + * * + * This file is part of The Dimension Library. * + * * + * The Dimension Library is free software; you can redistribute it and/ * + * or modify it under the terms of the GNU Lesser General Public License * + * as published by the Free Software Foundation; either version 3 of the * + * License, or (at your option) any later version. * + * * + * The Dimension Library is distributed in the hope that it will be * + * useful, but WITHOUT ANY WARRANTY; without even the implied warranty * + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * + * Lesser General Public License for more details. * + * * + * You should have received a copy of the GNU Lesser General Public * + * License along with this program. If not, see * + * <http://www.gnu.org/licenses/>. * + *************************************************************************/ + +#include "dimension.h" + +/* + * Checker pattern + */ + +static double +dmnsn_checker_pattern_fn(const dmnsn_pattern *checker, dmnsn_vector v) +{ + double xmod = fmod(v.x, 2.0); + double ymod = fmod(v.y, 2.0); + double zmod = fmod(v.z, 2.0); + + if (xmod < -dmnsn_epsilon) + xmod += 2.0; + if (ymod < -dmnsn_epsilon) + ymod += 2.0; + if (zmod < -dmnsn_epsilon) + zmod += 2.0; + + /* Return 0 when an even number of coordinates are in [0, 1), 1 otherwise */ + unsigned int n = 0; + if (xmod >= 1.0) + ++n; + if (ymod >= 1.0) + ++n; + if (zmod >= 1.0) + ++n; + return (n%2 == 0) ? 0.0 : 1.0; +} + +dmnsn_pattern * +dmnsn_new_checker_pattern() +{ + dmnsn_pattern *checker = dmnsn_new_pattern(); + checker->pattern_fn = &dmnsn_checker_pattern_fn; + return checker; +} |